Theme change across workspaces

Hii AnkitKukreja 

Power BI does not support centrally changing or enforcing themes across existing reports or workspaces. Organizational themes only make themes available they do not auto-apply. Each report must be updated and republished individually (manual or via automation/CI-CD).

We used Organization themes https://learn.microsoft.com/en-us/power-bi/create-reports/desktop-organizational-themes and selected the themes in the workspace to make it easy. Rather then downloading all the files and republishing it.